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freebsd-skq/sys/arm/include/asm.h
Ian Lepore 25166187e3 Fix unwind-info errors in our hand-written arm assembler code. 
We have functions nested within functions, and places where we start a
function then never end it, we just jump to the middle of something else.
We tried to express this with nested ENTRY()/END() macros (which result
in .fnstart and .fnend directives), but it turns out there's no way to
express that nesting in ARM EHABI unwind info, and newer tools treat
multiple .fnstart directives without an intervening .fnend as an error.

These changes introduce two new macros, EENTRY() and EEND().  EENTRY()
creates a global label you can call/jump to just like ENTRY(), but it
doesn't emit a .fnstart.  EEND() is a no-op that just documents the
conceptual endpoint that matches up with the same-named EENTRY().

This is based on patches submitted by Stepan Dyatkovskiy, but I made some
changes and added the EEND() stuff, so blame any problems on me.

Submitted by:	Stepan Dyatkovskiy <stpworld@narod.ru>
2014-08-01 18:24:44 +00:00

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/* $NetBSD: asm.h,v 1.5 2003/08/07 16:26:53 agc Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)asm.h 5.5 (Berkeley) 5/7/91
*
* $FreeBSD$
*/
#ifndef _MACHINE_ASM_H_
#define _MACHINE_ASM_H_
#include <sys/cdefs.h>
#define _C_LABEL(x) x
#define _ASM_LABEL(x) x
#define I32_bit (1 << 7) /* IRQ disable */
#define F32_bit (1 << 6) /* FIQ disable */
#define CPU_CONTROL_32BP_ENABLE 0x00000010 /* P: 32-bit exception handlers */
#define CPU_CONTROL_32BD_ENABLE 0x00000020 /* D: 32-bit addressing */
#ifndef _ALIGN_TEXT
# define _ALIGN_TEXT .align 0
#endif
#ifdef __ARM_EABI__
#define STOP_UNWINDING .cantunwind
#define _FNSTART .fnstart
#define _FNEND .fnend
#else
#define STOP_UNWINDING
#define _FNSTART
#define _FNEND
#endif
/*
* gas/arm uses @ as a single comment character and thus cannot be used here
* Instead it recognised the # instead of an @ symbols in .type directives
* We define a couple of macros so that assembly code will not be dependent
* on one or the other.
*/
#define _ASM_TYPE_FUNCTION #function
#define _ASM_TYPE_OBJECT #object
#define GLOBAL(X) .globl x
#define _ENTRY(x) \
.text; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; x: _FNSTART
#define _END(x) .size x, . - x; _FNEND
/*
* EENTRY()/EEND() mark "extra" entry/exit points from a function.
* The unwind info cannot handle the concept of a nested function, or a function
* with multiple .fnstart directives, but some of our assembler code is written
* with multiple labels to allow entry at several points. The EENTRY() macro
* defines such an extra entry point without a new .fnstart, so that it's
* basically just a label that you can jump to. The EEND() macro does nothing
* at all, except document the exit point associated with the same-named entry.
*/
#define _EENTRY(x) .globl x; .type x,_ASM_TYPE_FUNCTION; x:
#define _EEND(x) /* nothing */
#ifdef GPROF
# define _PROF_PROLOGUE \
mov ip, lr; bl __mcount
#else
# define _PROF_PROLOGUE
#endif
#define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
#define EENTRY(y) _EENTRY(_C_LABEL(y)); _PROF_PROLOGUE
#define ENTRY_NP(y) _ENTRY(_C_LABEL(y))
#define EENTRY_NP(y) _EENTRY(_C_LABEL(y))
#define END(y) _END(_C_LABEL(y))
#define EEND(y)
#define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
#define ASEENTRY(y) _EENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
#define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y))
#define ASEENTRY_NP(y) _EENTRY(_ASM_LABEL(y))
#define ASEND(y) _END(_ASM_LABEL(y))
#define ASEEND(y)
#define ASMSTR .asciz
#if defined(PIC)
#define PLT_SYM(x) PIC_SYM(x, PLT)
#define GOT_SYM(x) PIC_SYM(x, GOT)
#define GOT_GET(x,got,sym) \
ldr x, sym; \
ldr x, [x, got]
#define GOT_INIT(got,gotsym,pclabel) \
ldr got, gotsym; \
add got, got, pc; \
pclabel:
#define GOT_INITSYM(gotsym,pclabel) \
gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) + (. - (pclabel+4))
#ifdef __STDC__
#define PIC_SYM(x,y) x ## ( ## y ## )
#else
#define PIC_SYM(x,y) x/**/(/**/y/**/)
#endif
#else
#define PLT_SYM(x) x
#define GOT_SYM(x) x
#define GOT_GET(x,got,sym) \
ldr x, sym;
#define GOT_INIT(got,gotsym,pclabel)
#define GOT_INITSYM(gotsym,pclabel)
#define PIC_SYM(x,y) x
#endif /* PIC */
#undef __FBSDID
#if !defined(lint) && !defined(STRIP_FBSDID)
#define __FBSDID(s) .ident s
#else
#define __FBSDID(s) /* nothing */
#endif
#define WEAK_ALIAS(alias,sym) \
.weak alias; \
alias = sym
#ifdef __STDC__
#define WARN_REFERENCES(sym,msg) \
.stabs msg ## ,30,0,0,0 ; \
.stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
#else
#define WARN_REFERENCES(sym,msg) \
.stabs msg,30,0,0,0 ; \
.stabs __STRING(sym),1,0,0,0
#endif /* __STDC__ */
/* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */
/* The _ARM_ARCH_* macros are deprecated and will be removed soon. */
/* This should be moved into another header so it can be used in
* both asm and C code. machine/asm.h cannot be included in C code. */
#if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__)
#define _ARM_ARCH_7
#define _HAVE_ARMv7_INSTRUCTIONS 1
#endif
#if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \
defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \
defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__)
#define _ARM_ARCH_6
#define _HAVE_ARMv6_INSTRUCTIONS 1
#endif
#if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \
defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__)
#define _ARM_ARCH_5E
#define _HAVE_ARMv5E_INSTRUCTIONS 1
#endif
#if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \
defined (__ARM_ARCH_5T__)
#define _ARM_ARCH_5
#define _HAVE_ARMv5_INSTRUCTIONS 1
#endif
#if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__)
#define _ARM_ARCH_4T
#define _HAVE_ARMv4T_INSTRUCTIONS 1
#endif
/* FreeBSD requires ARMv4, so this is always set. */
#define _HAVE_ARMv4_INSTRUCTIONS 1
#if defined (_HAVE_ARMv4T_INSTRUCTIONS)
# define RET bx lr
# define RETeq bxeq lr
# define RETne bxne lr
# define RETc(c) bx##c lr
#else
# define RET mov pc, lr
# define RETeq moveq pc, lr
# define RETne movne pc, lr
# define RETc(c) mov##c pc, lr
#endif
#endif /* !_MACHINE_ASM_H_ */
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